diff --git a/eng/common/pipelines/templates/steps/create-pull-request.yml b/eng/common/pipelines/templates/steps/create-pull-request.yml
index e3b3e538c036..bdf923654c66 100644
--- a/eng/common/pipelines/templates/steps/create-pull-request.yml
+++ b/eng/common/pipelines/templates/steps/create-pull-request.yml
@@ -15,6 +15,7 @@ parameters:
   ScriptDirectory: eng/common/scripts
   GHReviewersVariable: '' 
   GHTeamReviewersVariable: ''
+  GHAssignessVariable: ''
   # Multiple labels seperated by comma, e.g. "bug, APIView"
   PRLabels: ''
   SkipCheckingForChanges: false
@@ -80,20 +81,7 @@ steps:
       -AuthToken "$(azuresdk-github-pat)"
       -PRTitle "${{ parameters.PRTitle }}"
       -PRBody "${{ coalesce(parameters.PRBody, parameters.CommitMsg, parameters.PRTitle) }}"
-      -PRLabels "${{ parameters.PRLabels}}"
-
-- task: PowerShell@2
-  displayName: Tag a Reviewer on PR
-  condition: and(succeeded(), eq(variables['HasChanges'], 'true'))
-  continueOnError: true
-  inputs:
-    pwsh: true
-    workingDirectory: ${{ parameters.WorkingDirectory }}
-    filePath: ${{ parameters.ScriptDirectory }}/add-pullrequest-reviewers.ps1
-    arguments: >
-      -RepoOwner "${{ parameters.RepoOwner }}"
-      -RepoName "$(RepoNameWithoutOwner)"
-      -AuthToken "$(azuresdk-github-pat)"
-      -GitHubUsers "$(${{ parameters.GHReviewersVariable }})"
-      -GitHubTeams "$(${{ parameters.GHTeamReviewersVariable }})"
-      -PRNumber "$(Submitted.PullRequest.Number)"
+      -PRLabels "${{ parameters.PRLabels }}"
+      -UserReviewers "${{ parameters.GHReviewersVariable }}"
+      -TeamReviewers "${{ parameters.GHTeamReviewersVariable }}"
+      -Assignees "${{ parameters.GHAssignessVariable }}"
diff --git a/eng/common/scripts/Add-IssueComment.ps1 b/eng/common/scripts/Add-IssueComment.ps1
index 7b797a12d418..b1d8a649797c 100644
--- a/eng/common/scripts/Add-IssueComment.ps1
+++ b/eng/common/scripts/Add-IssueComment.ps1
@@ -19,10 +19,10 @@ param(
 . "${PSScriptRoot}\common.ps1"
 
 try {
-  Add-IssueComment -RepoOwner $RepoOwner -RepoName $RepoName `
+  Add-GithubIssueComment -RepoOwner $RepoOwner -RepoName $RepoName `
   -IssueNumber $IssueNumber -Comment $Comment -AuthToken $AuthToken
 }
 catch {
-  LogError "Add-IssueComment failed with exception:`n$_"
+  LogError "Add-GithubIssueComment failed with exception:`n$_"
   exit 1
 }
\ No newline at end of file
diff --git a/eng/common/scripts/Add-IssueLabels.ps1 b/eng/common/scripts/Add-IssueLabels.ps1
index 7f0debe35610..0cd4837e69ad 100644
--- a/eng/common/scripts/Add-IssueLabels.ps1
+++ b/eng/common/scripts/Add-IssueLabels.ps1
@@ -19,10 +19,10 @@ param(
 . "${PSScriptRoot}\common.ps1"
 
 try {
-  Add-IssueLabels -RepoOwner $RepoOwner -RepoName $RepoName `
+  Add-GithubIssueLabels -RepoOwner $RepoOwner -RepoName $RepoName `
   -IssueNumber $IssueNumber -Labels $Labels -AuthToken $AuthToken
 }
 catch {
-  LogError "Add-IssueLabels failed with exception:`n$_"
+  LogError "Add-GithubIssueLabels failed with exception:`n$_"
   exit 1
 }
\ No newline at end of file
diff --git a/eng/common/scripts/Delete-RemoteBranches.ps1 b/eng/common/scripts/Delete-RemoteBranches.ps1
index da55471ef25f..0ca7c55be932 100644
--- a/eng/common/scripts/Delete-RemoteBranches.ps1
+++ b/eng/common/scripts/Delete-RemoteBranches.ps1
@@ -9,10 +9,10 @@ param(
 
 LogDebug "Operating on Repo [ $RepoName ]"
 try{
-  $branches = (List-References -RepoOwner $RepoOwner -RepoName $RepoName -Ref "heads/$BranchPrefix").ref
+  $branches = (Get-GitHubSourceReferences -RepoOwner $RepoOwner -RepoName $RepoName -Ref "heads/$BranchPrefix").ref
 }
 catch {
-  LogError "List-References failed with exception:`n$_"
+  LogError "Get-GitHubSourceReferences failed with exception:`n$_"
   exit 1
 }
 
@@ -22,11 +22,11 @@ foreach ($branch in $branches)
     $branchName = $branch.Replace("refs/heads/","")
     $head = "${RepoOwner}/${RepoName}:${branchName}"
     LogDebug "Operating on branch [ $branchName ]"
-    $pullRequests = List-PullRequests -RepoOwner $RepoOwner -RepoName $RepoName -head $head
+    $pullRequests = Get-GitHubPullRequests -RepoOwner $RepoOwner -RepoName $RepoName -head $head
   }
   catch
   {
-    LogError "List-PullRequests failed with exception:`n$_"
+    LogError "Get-GitHubPullRequests failed with exception:`n$_"
     exit 1
   }
 
@@ -34,10 +34,10 @@ foreach ($branch in $branches)
   {
     LogDebug "Branch [ $branchName ] in repo [ $RepoName ] has no associated Pull Request. Deleting Branch"
     try{
-      Delete-References -RepoOwner $RepoOwner -RepoName $RepoName -Ref ($branch.Remove(0,5)) -AuthToken $AuthToken
+      Remove-GitHubSourceReferences -RepoOwner $RepoOwner -RepoName $RepoName -Ref ($branch.Remove(0,5)) -AuthToken $AuthToken
     }
     catch {
-      LogError "Delete-References failed with exception:`n$_"
+      LogError "Remove-GitHubSourceReferences failed with exception:`n$_"
       exit 1
     }
   }
diff --git a/eng/common/scripts/Get-PullRequestCreator.ps1 b/eng/common/scripts/Get-PullRequestCreator.ps1
new file mode 100644
index 000000000000..1b531ad5ee70
--- /dev/null
+++ b/eng/common/scripts/Get-PullRequestCreator.ps1
@@ -0,0 +1,24 @@
+param (
+    [Parameter(Mandatory = $true)]
+    [string]$RepoOwner,
+
+    [Parameter(Mandatory = $true)]
+    [string]$RepoName,
+
+    [Parameter(Mandatory = $true)]
+    $PullRequestNumber
+)
+
+. "${PSScriptRoot}\common.ps1"
+
+try
+{
+    $pullRequest = Get-GithubPullRequest -RepoOwner $RepoOwner -RepoName $RepoName -PullRequestNumber $PullRequestNumber
+    Write-Host "##vso[task.setvariable variable=System.PullRequest.Creator;]$($pullRequest.user.login)"
+}
+catch
+{
+    Write-Error "Get-PullRequest failed with exception:`n$_"
+    exit 1
+}
+
diff --git a/eng/common/scripts/Invoke-GitHubAPI.ps1 b/eng/common/scripts/Invoke-GitHubAPI.ps1
index 22f370f3202f..c5d2bea1db44 100644
--- a/eng/common/scripts/Invoke-GitHubAPI.ps1
+++ b/eng/common/scripts/Invoke-GitHubAPI.ps1
@@ -1,3 +1,7 @@
+if ((Get-ChildItem -Path Function: | ? { $_.Name -eq "LogWarning" }).Count -eq 0) {
+  . "${PSScriptRoot}\logging.ps1"
+}
+
 $GithubAPIBaseURI = "https://api.github.com/repos"
 
 function Get-GitHubHeaders ($token) {
@@ -17,14 +21,26 @@ function Invoke-GitHubAPIPost {
     $token
   )
 
-  $resp = Invoke-RestMethod `
-    -Method POST `
-    -Body ($body | ConvertTo-Json) `
-    -Uri $apiURI `
-    -Headers (Get-GitHubHeaders -token $token) `
-    -MaximumRetryCount 3
-
-  return $resp
+  try {
+    if ($body.Count -gt 0) {
+      $resp = Invoke-RestMethod `
+      -Method POST `
+      -Body ($body | ConvertTo-Json) `
+      -Uri $apiURI `
+      -Headers (Get-GitHubHeaders -token $token) `
+      -MaximumRetryCount 3
+  
+      return $resp
+    }
+    else {
+      throw "Did not fire request because of empty body."
+    }
+  }
+  catch {
+    $warning = "{0} with Uri [ $apiURI ] failed. `nBody: [ {1} ]" -f (Get-PSCallStack)[1].FunctionName , ($body | Out-String)
+    LogWarning $warning
+    throw 
+  }
 }
 
 function Invoke-GitHubAPIPatch {
@@ -37,14 +53,26 @@ function Invoke-GitHubAPIPatch {
     $token
   )
 
-  $resp = Invoke-RestMethod `
-    -Method PATCH `
-    -Body ($body | ConvertTo-Json) `
-    -Uri $apiURI `
-    -Headers (Get-GitHubHeaders -token $token) `
-    -MaximumRetryCount 3
+  try {
+    if ($body.Count -gt 0) {
+      $resp = Invoke-RestMethod `
+      -Method PATCH `
+      -Body ($body | ConvertTo-Json) `
+      -Uri $apiURI `
+      -Headers (Get-GitHubHeaders -token $token) `
+      -MaximumRetryCount 3
 
-  return $resp
+      return $resp
+    }
+    else {
+      throw "Did not fire request because of empty body."
+    }
+  }
+  catch {
+    $warning = "{0} with Uri [ $apiURI ] failed. `nBody: [ {1} ]" -f (Get-PSCallStack)[1].FunctionName , ($body | Out-String)
+    LogWarning $warning
+    throw 
+  }
 }
 
 function Invoke-GitHubAPIDelete {
@@ -55,13 +83,20 @@ function Invoke-GitHubAPIDelete {
     $token
   )
 
-  $resp = Invoke-RestMethod `
+  try {
+    $resp = Invoke-RestMethod `
     -Method DELETE `
     -Uri $apiURI `
     -Headers (Get-GitHubHeaders -token $token) `
     -MaximumRetryCount 3
 
-  return $resp
+    return $resp
+  }
+  catch {
+    $warning = "{0} with Uri [ $apiURI ] failed." -f (Get-PSCallStack)[1].FunctionName
+    LogWarning $warning
+    throw
+  }
 }
 
 
@@ -72,31 +107,48 @@ function Invoke-GitHubAPIGet {
     $token
   )
 
-  if ($token)
-  {
-    $resp = Invoke-RestMethod `
-      -Method GET `
-      -Uri $apiURI `
-      -Headers (Get-GitHubHeaders -token $token) `
-      -MaximumRetryCount 3
+  try {
+    if ($token)
+    {
+      $resp = Invoke-RestMethod `
+        -Method GET `
+        -Uri $apiURI `
+        -Headers (Get-GitHubHeaders -token $token) `
+        -MaximumRetryCount 3
+    }
+    else {
+      $resp = Invoke-RestMethod `
+        -Method GET `
+        -Uri $apiURI `
+        -MaximumRetryCount 3
+    }
+    return $resp
   }
-  else {
-    $resp = Invoke-RestMethod `
-      -Method GET `
-      -Uri $apiURI `
-      -MaximumRetryCount 3
+  catch {
+    $warning = "{0} with Uri [ $apiURI ] failed." -f (Get-PSCallStack)[1].FunctionName
+    LogWarning $warning
+    throw 
   }
-
-  return $resp
 }
 
-function SplitMembers ($membersString)
-{
-  if (!$membersString) { return $null }
-  return @($membersString.Split(",") | % { $_.Trim() } | ? { return $_ })
+function Set-GitHubAPIParameters ($members,  $parameterName, $parameters, $allowEmptyMembers=$false) {
+  if ($null -ne $members) {
+    if ($members -is [array])
+    {
+      $parameters[$parameterName] = $members
+    }
+    else {
+      $memberAdditions = @($members.Split(",") | % { $_.Trim() } | ? { return $_ })
+      if (($memberAdditions.Count -gt 0) -or $allowEmptyMembers) {
+        $parameters[$parameterName] = $memberAdditions
+      }
+    }
+  }
+
+  return $parameters
 }
 
-function List-PullRequests {
+function Get-GitHubPullRequests {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -109,18 +161,20 @@ function List-PullRequests {
     [ValidateSet("created","updated","popularity","long-running")]
     $Sort,
     [ValidateSet("asc","desc")]
-    $Direction
+    $Direction,
+    [ValidateNotNullOrEmpty()]
+    $AuthToken
   )
 
   $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/pulls"
-  if ($State -or $Head -or $Base -or $Sort -or $Direction) { $uri += '?'}
+  if ($State -or $Head -or $Base -or $Sort -or $Direction) { $uri += '?' }
   if ($State) { $uri += "state=$State&" }
   if ($Head) { $uri += "head=$Head&" }
   if ($Base) { $uri += "base=$Base&" }
   if ($Sort) { $uri += "sort=$Sort&" }
   if ($Direction){ $uri += "direction=$Direction&" }
 
-  return Invoke-GitHubAPIGet -apiURI $uri
+  return Invoke-GitHubAPIGet -apiURI $uri -token $AuthToken
 }
 
 # 
@@ -129,22 +183,73 @@ function List-PullRequests {
 Ref to search for
 Pass 'heads/<branchame> ,tags/<tag name>, or nothing
 #>
-function List-References {
+function Get-GitHubSourceReferences {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
     [Parameter(Mandatory = $true)]
     $RepoName,
-    $Ref
+    $Ref,
+    [ValidateNotNullOrEmpty()]
+    $AuthToken
   )
 
   $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/git/matching-refs/"
   if ($Ref) { $uri += "$Ref" }
 
-  return Invoke-GitHubAPIGet -apiURI $uri
+  return Invoke-GitHubAPIGet -apiURI $uri -token $AuthToken
 }
 
-function Add-IssueComment {
+function Get-GitHubPullRequest {
+  param (
+    [Parameter(Mandatory = $true)]
+    $RepoOwner,
+    [Parameter(Mandatory = $true)]
+    $RepoName,
+    [Parameter(Mandatory = $true)]
+    $PullRequestNumber,
+    [ValidateNotNullOrEmpty()]
+    $AuthToken
+  )
+
+  $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/pulls/$PullRequestNumber"
+  return Invoke-GitHubAPIGet -apiURI $uri -token $AuthToken
+}
+
+function New-GitHubPullRequest {
+  param (
+    [Parameter(Mandatory = $true)]
+    $RepoOwner,
+    [Parameter(Mandatory = $true)]
+    $RepoName,
+    [Parameter(Mandatory = $true)]
+    $Title,
+    [Parameter(Mandatory = $true)]
+    $Head,
+    [Parameter(Mandatory = $true)]
+    $Base,
+    $Body=$Title,
+    [Boolean]$Maintainer_Can_Modify=$false,
+    [Boolean]$Draft=$false,
+    [ValidateNotNullOrEmpty()]
+    [Parameter(Mandatory = $true)]
+    $AuthToken
+  )
+
+  $parameters = @{
+    title                 = $Title
+    head                  = $Head
+    base                  = $Base
+    body                  = $Body
+    maintainer_can_modify = $Maintainer_Can_Modify
+    draft                = $Draft
+  }
+
+  $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/pulls"
+  return Invoke-GitHubAPIPost -apiURI $uri -body $parameters -token $AuthToken
+}
+
+function Add-GitHubIssueComment {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -154,6 +259,7 @@ function Add-IssueComment {
     $IssueNumber,
     [Parameter(Mandatory = $true)]
     $Comment,
+    [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $AuthToken
 
@@ -168,7 +274,7 @@ function Add-IssueComment {
 }
 
 # Will add labels to existing labels on the issue
-function Add-IssueLabels {
+function Add-GitHubIssueLabels {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -179,27 +285,27 @@ function Add-IssueLabels {
     [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $Labels,
+    [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $AuthToken
   )
 
   if ($Labels.Trim().Length -eq 0)
   {
-    throw "The 'Labels' parameter should not not be whitespace..`
-    You can use the 'Update-Issue' function if you plan to reset the labels"
+    throw " The 'Labels' parameter should not not be whitespace.
+    Use the 'Update-Issue' function if you plan to reset the labels"
   }
 
   $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/issues/$IssueNumber/labels"
-  $labelAdditions = SplitMembers -membersString $Labels
-  $parameters = @{
-    labels = @($labelAdditions)
-  }
+  $parameters = @{}
+  $parameters = Set-GitHubAPIParameters -members $Labels -parameterName "labels" `
+  -parameters $parameters
 
   return Invoke-GitHubAPIPost -apiURI $uri -body $parameters -token $AuthToken
 }
 
 # Will add assignees to existing assignees on the issue
-function Add-IssueAssignees {
+function Add-GitHubIssueAssignees {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -210,28 +316,55 @@ function Add-IssueAssignees {
     [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $Assignees,
+    [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $AuthToken
   )
 
   if ($Assignees.Trim().Length -eq 0)
   {
-    throw "The 'Assignees' parameter should not be whitespace.`
+    throw "The 'Assignees' parameter should not be whitespace.
     You can use the 'Update-Issue' function if you plan to reset the Assignees"
   }
 
   $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/issues/$IssueNumber/assignees"
-  $assigneesAdditions = SplitMembers -membersString $Assignees
-  $parameters = @{
-    assignees = @($assigneesAdditions)
-  }
+  $parameters = @{}
+  $parameters = Set-GitHubAPIParameters -members $Assignees -parameterName "assignees" `
+  -parameters $parameters
+
+  return Invoke-GitHubAPIPost -apiURI $uri -body $parameters -token $AuthToken
+}
+
+function Add-GitHubPullRequestReviewers {
+  param (
+    [Parameter(Mandatory = $true)]
+    $RepoOwner,
+    [Parameter(Mandatory = $true)]
+    $RepoName,
+    [Parameter(Mandatory = $true)]
+    $PrNumber,
+    $Users,
+    $Teams,
+    [ValidateNotNullOrEmpty()]
+    [Parameter(Mandatory = $true)]
+    $AuthToken
+  )
+
+  $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/pulls/$PrNumber/requested_reviewers"
+  $parameters = @{}
+
+  $parameters = Set-GitHubAPIParameters -members $Users -parameterName "reviewers" `
+  -parameters $parameters
+
+  $parameters = Set-GitHubAPIParameters -members $Teams -parameterName "team_reviewers" `
+  -parameters $parameters
 
   return Invoke-GitHubAPIPost -apiURI $uri -body $parameters -token $AuthToken
 }
 
 # For labels and assignee pass comma delimited string, to replace existing labels or assignees.
 # Or pass white space " " to remove all labels or assignees
-function Update-Issue {
+function Update-GitHubIssue {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -244,10 +377,9 @@ function Update-Issue {
     [ValidateSet("open","closed")]
     [string]$State,
     [int]$Milestome,
+    $Labels,
+    $Assignees,
     [ValidateNotNullOrEmpty()]
-    [string]$Labels,
-    [ValidateNotNullOrEmpty()]
-    [string]$Assignees,
     [Parameter(Mandatory = $true)]
     $AuthToken
   )
@@ -258,19 +390,17 @@ function Update-Issue {
   if ($Body) { $parameters["body"] = $Body }
   if ($State) { $parameters["state"] = $State }
   if ($Milestone) { $parameters["milestone"] = $Milestone }
-  if ($Labels) { 
-    $labelAdditions = SplitMembers -membersString $Labels
-    $parameters["labels"] = @($labelAdditions)
-  }
-  if ($Assignees) { 
-    $assigneesAdditions = SplitMembers -membersString $Assignees
-    $parameters["assignees"] = @($assigneesAdditions)
-  }
+
+  $parameters = Set-GitHubAPIParameters -members $Labels -parameterName "labels" `
+  -parameters $parameters -allowEmptyMembers $true
+
+  $parameters = Set-GitHubAPIParameters -members $Assignees -parameterName "assignees" `
+  -parameters $parameters -allowEmptyMembers $true
 
   return Invoke-GitHubAPIPatch -apiURI $uri -body $parameters -token $AuthToken
 }
 
-function Delete-References {
+function Remove-GitHubSourceReferences  {
   param (
     [Parameter(Mandatory = $true)]
     $RepoOwner,
@@ -279,13 +409,14 @@ function Delete-References {
     [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $Ref,
+    [ValidateNotNullOrEmpty()]
     [Parameter(Mandatory = $true)]
     $AuthToken
   )
 
   if ($Ref.Trim().Length -eq 0)
   {
-    throw "You must supply a valid 'Ref' Parameter to 'Delete-Reference'."
+    throw "You must supply a valid 'Ref' Parameter to 'Delete-GithubSourceReferences'."
   }
 
   $uri = "$GithubAPIBaseURI/$RepoOwner/$RepoName/git/refs/$Ref"
diff --git a/eng/common/scripts/Submit-PullRequest.ps1 b/eng/common/scripts/Submit-PullRequest.ps1
index 93ca35512c85..58a082baaf26 100644
--- a/eng/common/scripts/Submit-PullRequest.ps1
+++ b/eng/common/scripts/Submit-PullRequest.ps1
@@ -48,87 +48,53 @@ param(
   [Parameter(Mandatory = $false)]
   [string]$PRBody = $PRTitle,
 
-  [Parameter(Mandatory = $false)]
-  [string]$PRLabels
-)
+  [string]$PRLabels,
 
-$headers = @{
-  Authorization = "bearer $AuthToken"
-}
+  [string]$UserReviewers,
 
-$query = "state=open&head=${PROwner}:${PRBranch}&base=${BaseBranch}"
+  [string]$TeamReviewers,
 
-function AddLabels([int] $prNumber, [string] $prLabelString, [array] $existingLabels)
-{
-  # Adding labels to the pr.
-  if (-not $prLabelString) {
-    Write-Verbose "There are no labels added to the PR."
-    return
-  }
-
-  # Parse the labels from string to array
-  $prLabelArray = @($prLabelString.Split(",") | % { $_.Trim() } | ? { return $_ })
-  foreach ($label in $existingLabels) {
-    if ($prLabelArray -contains $label.name) {
-      continue
-    }
-    $prLabelArray += $label.name
-  }
-  $prLabelUri = "https://api.github.com/repos/$RepoOwner/$RepoName/issues/$prNumber"
-  $labelRequestData = @{
-    labels = $prLabelArray
-  }
-  try {
-    $resp = Invoke-RestMethod -Method PATCH -Headers $headers $prLabelUri -Body ($labelRequestData | ConvertTo-Json)
-  }
-  catch {
-    Write-Error "Invoke-RestMethod $prLabelUri failed with exception:`n$_"
-  }
+  [string]$Assignees
+)
 
-  $resp | Write-Verbose
-  Write-Host -f green "Label(s) [$prLabelArray] added to pull request: https://github.com/$RepoOwner/$RepoName/pull/$prNumber"
-}
+. "${PSScriptRoot}\common.ps1"
 
 try {
-  $resp = Invoke-RestMethod -Headers $headers "https://api.github.com/repos/$RepoOwner/$RepoName/pulls?$query"
+  $resp = Get-GitHubPullRequests -RepoOwner $RepoOwner -RepoName $RepoName `
+  -Head "${PROwner}:${PRBranch}" -Base $BaseBranch
 }
 catch { 
-  Write-Error "Invoke-RestMethod [https://api.github.com/repos/$RepoOwner/$RepoName/pulls?$query] failed with exception:`n$_"
+  LogError "Get-GitHubPullRequests failed with exception:`n$_"
   exit 1
 }
+
 $resp | Write-Verbose
 
 if ($resp.Count -gt 0) {
-    Write-Host -f green "Pull request already exists $($resp[0].html_url)"
-
-    # setting variable to reference the pull request by number
-    Write-Host "##vso[task.setvariable variable=Submitted.PullRequest.Number]$($resp[0].number)"
-    AddLabels $resp[0].number $PRLabels $resp[0].labels
+  LogDebug "Pull request already exists $($resp[0].html_url)"
+  # setting variable to reference the pull request by number
+  Write-Host "##vso[task.setvariable variable=Submitted.PullRequest.Number]$($resp[0].number)"
 }
 else {
-  $data = @{
-    title                 = $PRTitle
-    head                  = "${PROwner}:${PRBranch}"
-    base                  = $BaseBranch
-    body                  = $PRBody
-    maintainer_can_modify = $true
-  }
-
   try {
-    $resp = Invoke-RestMethod -Method POST -Headers $headers `
-                              "https://api.github.com/repos/$RepoOwner/$RepoName/pulls" `
-                              -Body ($data | ConvertTo-Json)
+    $resp = New-GitHubPullRequest -RepoOwner $RepoOwner -RepoName $RepoName -Title $PRTitle `
+    -Head "${PROwner}:${PRBranch}" -Base $BaseBranch -Body $PRBody -Maintainer_Can_Modify $true `
+    -AuthToken $AuthToken
+
+    $resp | Write-Verbose
+    LogDebug "Pull request created https://github.com/$RepoOwner/$RepoName/pull/$($resp.number)"
+  
+    # setting variable to reference the pull request by number
+    Write-Host "##vso[task.setvariable variable=Submitted.PullRequest.Number]$($resp.number)"
+
+    Update-GitHubIssue -RepoOwner $RepoOwner -RepoName $RepoName -IssueNumber $resp.number `
+    -Labels $PRLabels -Assignees $Assignees -AuthToken $AuthToken
+
+    Add-GitHubPullRequestReviewers -RepoOwner $RepoOwner -RepoName $RepoName -PrNumber $resp.number `
+    -Users $UserReviewers -Teams $TeamReviewers -AuthToken $AuthToken
   }
   catch {
-    Write-Error "Invoke-RestMethod [https://api.github.com/repos/$RepoOwner/$RepoName/pulls] failed with exception:`n$_"
+    LogError "Call to GitHub API failed with exception:`n$_"
     exit 1
   }
-
-  $resp | Write-Verbose
-  Write-Host -f green "Pull request created https://github.com/$RepoOwner/$RepoName/pull/$($resp.number)"
-
-  # setting variable to reference the pull request by number
-  Write-Host "##vso[task.setvariable variable=Submitted.PullRequest.Number]$($resp.number)"
-
-  AddLabels $resp.number $PRLabels $resp.labels
 }
diff --git a/eng/common/scripts/add-pullrequest-reviewers.ps1 b/eng/common/scripts/add-pullrequest-reviewers.ps1
deleted file mode 100644
index 3198dcb40d2c..000000000000
--- a/eng/common/scripts/add-pullrequest-reviewers.ps1
+++ /dev/null
@@ -1,61 +0,0 @@
-param(
-    [Parameter(Mandatory = $true)]
-    $RepoOwner,
-
-    [Parameter(Mandatory = $true)]
-    $RepoName,
-
-    [Parameter(Mandatory = $false)]
-    $GitHubUsers = "",
-
-    [Parameter(Mandatory = $false)]
-    $GitHubTeams = "",
-
-    [Parameter(Mandatory = $true)]
-    $PRNumber,
-  
-    [Parameter(Mandatory = $true)]
-    $AuthToken
-)
-
-function AddMembers($memberName, $additionSet) {
-  $headers = @{
-    Authorization = "bearer $AuthToken"
-  }
-  $uri = "https://api.github.com/repos/$RepoOwner/$RepoName/pulls/$PRNumber/requested_reviewers"
-  $errorOccurred = $false
-
-  foreach ($id in $additionSet) {
-    try {
-      $postResp = @{}
-      $postResp[$memberName] = @($id)
-      $postResp = $postResp | ConvertTo-Json
-
-      Write-Host $postResp
-      $resp = Invoke-RestMethod -Method Post -Headers $headers -Body $postResp -Uri $uri -MaximumRetryCount 3
-      $resp | Write-Verbose
-    }
-    catch {
-      Write-Host "Error attempting to add $user `n$_"
-      $errorOccurred = $true
-    }
-  }
-
-  return $errorOccurred
-}
-
-# at least one of these needs to be populated
-if (-not $GitHubUsers -and -not $GitHubTeams) {
-  Write-Host "No user provided for addition, exiting."
-  exit 0
-}
-
-$userAdditions = @($GitHubUsers.Split(",") | % { $_.Trim() } | ? { return $_ })
-$teamAdditions = @($GitHubTeams.Split(",") | % { $_.Trim() } | ? { return $_ })
-
-$errorsOccurredAddingUsers = AddMembers -memberName "reviewers" -additionSet $userAdditions
-$errorsOccurredAddingTeams = AddMembers -memberName "team_reviewers" -additionSet $teamAdditions
-
-if ($errorsOccurredAddingUsers -or $errorsOccurredAddingTeams) {
-  exit 1
-}